Hi. looking for help with simplifying an identity. The identity to be simplified is:
tan^4x + 2tan^2x + 1.
I'm confident that 2tan^2x + 1 will break down into:
tan^2x + tan^2x + 1 which equals tan^2x + sec^2x. But I'm not sure how to treat the tan^4 when converting to secant.
Any help will be much appreciate.